Reaktywne formy tlenu w mechanizmach obronnych roślin
Reactive Oxygen Species in plant defense reactions

Summary/Abstract: Could plants successfully defend themselves against bacteria, viruses and fungi attacking their cells? Have plants developed defense mechanisms against stress factors occurring in the environment during evolution? Once it was thought that plants do not posses specific defense systems against stress, however, currently it is known that, plants can successfully fend off the attack of microorganisms as well as minimize effects of environmental stress. One of the first plant cells defense response is an alternation in membrane permeability what results in flow of ions and cell membrane depolarization. Such changes lead to an increase in synthesis of reactive oxygen species (ROS). Rapid increase in the concentration of ROS in plant tissues occurring after contact of a plant with microorganisms or abiotic stress factors is commonly termed as respiratory burst In consequence the high concentration of ROS in plant tissues triggers chain of biochemical reactions leading to activation of systemic plant resistance. The increase in plant resistance is possible due to the activation of Hypersensitive Reaction and and biosynthesis of cell components of plant structural barriers.

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